Furnace



Feb. 19 .1924, I

A. J. GRINDLE FURNACE Original Filed Feb. 4. 1922 2 Sheets-Sheet 1 1 .2WN "15g Feb. 19 1924. J GR'NDLE' rummcz 2 Sheets-Sheet? 1 ori inal F1156Feb. 4, 1922 Patented Feb. 19, 1924.

AUBREY .J. IGRINDLEX or om-oAGQ ILLINOIS),ASSLGQNORJIOGRINDIFEJFUEL--EQIIIP1VBE1\'ET COM-SPANK? or, Helm-Ex, ILLINOIS; ACQRPOBIA'DIONnOF-IILLINQISE.

FURNACE.

Application "fiIed'February 4*, 1922, Seria1 Nbi534j259 i' *Rcirew'efl'Decembefm', '1923.

To all whom it may concern! Be it known'that I AUBREY J; GRINDDE; acitizen of the United States, residing at Chicago, in the county of-Cook and? State of Illinois, ha-veinven'ted a certainnew end usefulImprovement in Furnaces, ofvwhic'h the 'followingds -a specification.

This invention relates-to furnaces. Itfis specially applicable toannealing furnaces and for the heating of e11scissor-products requiringheat in the-'- process (if-manufaccure.

In furnaces of the general class'-set'forth,-it is necessary to; bIingthe afitmes which roduoe' the heat'or'th'efproducts ofc'om-us tion'thereofinto the *fiirnace in contact-With the articles to be heated;this being "partie zlllally true where powdere'dcoa -l is used as a el.i

The object ofi'this invention isto-construct a furnace with'fiuesiorcarrying-the products ofcombustion' from the furnace to the stackerother-discharge device so arranged thet} the ma jor pert ofthe dust orask which is necessarily found in 'the-lhot gas or other product ofcombustidn, is deposited in such a positioni thit' i-t, cit-nbe readilyWithdrawn without its pas-sing "up the stack and' out into the open air;Another princi-p ail o'bject'of the invention is to construct the finesso *tlra' t' they casnno't b come cloggedby the passing ash -or -'dust;this primarily by providing ready "mewns}of withdrawing I the depositedash or other waste product. I

The invention consists a; device capable. of attainingjtheforegoing-objects, which can becompzuratively easily ztnd' cheaplyconstructed, Wllldli is veryisi-i'nple and efiici'ent an operation and'is -n'ot readily I lizt-ble to get out of order. More I pert-louleirlythe invention consists -=i'nnumerous fezttures amddef tzztilsl oi'construction will be herewft'el' more fully set "forth in thespecification and claims,

Referring to the-drawings; n-r-Which hke numerals designate the" S83E18parts through out the sever-a l Views+- Figure 1- is a sectiondlqilirriviewof a structure illustrating this inveii tifon in I its preferredform;

Figure 2; is a central 'vei ticail "sectional Figure: 3 is sectionaliendView, taken on t-he" irregiilar "li'ne' *of Figure: 1";

Figure 5 5s a-"se'ctione l detail View of is damper take-atepproximaitelyithetline '55 otFigure 1 v 7 FifgflTGG is another detailView of the seme-demperteken on approximately the line 6-6- o fF-igure"1'; and v Figure 7 is en-enlarged end detail 1 view of the*lever operatingmechanism for the dampers, shoW-n'in- Figures 5 midi-'6.

The clevice 401" "this, invention is shown applied to a,furnec'ef-haivinge main'fio'or 10*011 *whih the articles to be" heated"are adapted to be placed in any suit-eblemen ner'." About this flooreretwo p'zi'rtllel side Walls 12-;"a rear wen-14 carrying efco'nwieirtiona l 5 form ofstack 16-, a set of remov- 2ible'EEront-doorsand it curved roof 20; all of-conVentional form, except asi'to detailsh'erea-fiterjdescribed, the operaifiion" of thefurnace' thus/fer"described; the doors 184mm wholly removed by conventional impositionand sealednp 'iniconyentionell manner, whereupon the furnace is: readyfer the' epplice-tion of heat.-

In hpplj ingftlris invention" to; this conventiorra1- fonn 0'f' furnacejust described; the Walls -I'Qha re "provided with horizontally placed*fitres or passages '22,"comminiica,ti=ng at the-rea'r od thefiirr'ia'ce withxconne'cting transverse passages "24; leading into thestack 16. 'Tliese p ztssagge's Q 2" en'd 24'. .ztre of suflicient heightaboveftlie tofp ofthe' floors 10' 'thetfithe "bottoms ofthe' passagewayscan be const rnct'ed' inj'sew" tooth cross section 26'or 28" ofsnfiicient heiglitj so that gas intakepassajges 30" or 32}cen"be"constr1icted below rtihe bottcihi oftheseyv tooth" formet-ion.(m-d adherent *t'Q the upper siu' tace" of the floor-10 and "ther is"enough cleerahQeT sp' ace bet-weenthe 'irpper ridges 34 or 36? otf th'fle'rent set's "oif fsz'xwi teetlf" and? int-ens? oof' slirita'ces 38*of 'fihe fiiiesi iend 24sec that a cleer passrge isifinrhished'flfor'l l'ie 'enggcleri-ty -or the sewtooth c ss' 'sec tion bottoms of theflues 22 and 24 should be such that as hot gas passes through the fiuesto the stack and dust is deposited from the gas on the inclined face ofthesaw tooth section bottoms of the Hues 22 and 24:, substantially allof the dust so deposited will slide down, the inclined surfaces and dropinto the openings 30 or 32, as the case may be.

Certain of the openings 30 located at the front of the furnace, intheparticular casethe dampers, in selected positions, is a pin 5O cariedby a chain 52, the pin being selectively insertable in holes 54 or 56,as the case may be, provided adjacent to the stops a6 and 48.

In similar manner, a certain number, in the particular case hereillustrated, two of theopening 30 in the rear parts of the side Walls 12are equipped with dampers 59 mounted on a control shaft conventionallyoperatable from the rear of the furnace by a lever 62 corresponding tohand lever 44.

The roof 20 is by preference placed, as shown in Figure 1, with its rearend Gt substantially higher than its front end .66, so that the innersurface 68 is inclined downwardly from the rear of the furnace towardsthe front. The rear wall 14 is recessed at 70, immediately adjacent tothe upper end 64 of the roof, to permit the insertion of a plurality, inthe particular case here illustrated,

, two, fuel nozzles 72 for the introduction of any sort of fuel,preferably but not necessarily powdered coal, the same being suppliedtothese nozzles by suitable supply pipes, not shown, extending totheleft beyond Figures 1 and 2. I

In the operation of the furnace thus constructed, and loaded withvmaterial to be heated, as heretofore described, the nozzles 72 arelighted, with the result that the products of combustion from the fuelmaterial entering the furnace through. said nozzles pass in well knownmanner along the interior surface 68 of the roof 20 both toward thefront end of the furnace and more or less downwardly towardthe flooruntil the entire furnace chamber is filled with hot gases, which mustescape, and this escape i provided by the perforations 30 and 32 in thebottoms of the respective flues 22 and 2a. When the gas does so passinto the openings 30 and 32, it ascends over the sides of the saw toothbottom members 26 and 28 in these flues, depositing more or less ash orother solid material thereon, and

finally in the obvious manner, passes to and out of the stack 16.Because of this depositing of ash on the saw tooth section bottoms ofthe fines, the ash obviously does not pass out of the stack to theannoyance of third parties adjacent to the furnace. Owing to theinclination of the ridges in the saw tooth bottoms of these flues 22 and24, the ash, as formed, slips in large measure down'the inclinedsurfaces of the bottoms of the fines into the bottoms of the opening 30and 32, where it rests on therfloor in little piles until opportunityoccurs, due to the nonuseof the furnace, frequently after several days,for the removal of the ash. This is accomplished in the particularfurnace here illustrated by entering the furnace when cold and shovelingout the little piles of ash from the bottoms of the opening and 32.

The furnace may be regulated to accommodatematerial to be worked upon indifferent quantities or differently positioned in the furnace'byl'egulating the dampers 40 and 59 in obvious manner to cause the hotgas furnished by the nozzle 72 to distribute itself through variouscombinations of the openings 30 as the work in hand may require. Inother -words,iby properly partially or wholly openingvariouscombinations of the dampers 40. and- 59, uniform heat throughout thefurnacemay be established and maintained. .7

This construction of flue with saw tooth section bottomand clean-outopenings at the floor level of the furnace is, sov far as I am aware,wholly new and applicable to a great many types of furnace other thanthe particular one shown in the drawings. Attention is called to thefact that the flues '22 and 24 do not have to be provided with anyopenings for removal of ash or dust except the normal gas intakeopenings 30 and 32 leading to them, which have to be provided any wayand through which the waste ash or dust is ultimately removed.

While it does not enter into the invention it may be stated that thestack 16 is provided with a. conventional shut-off damper 74 for closurewhen the heat is shut off, to retain the previously generated heatwithin the furnace.

The bottom of thestack is preferably, but not necessarily provided witha conventional form of clean-out door 76.

. ,What I claim is:

1. In mechanism of the classdescribed, a flue for the passage of gas toa stack or the like provided with a bottom of sawtooth cross sectionover which gas in the flue passes, there being, in the bottoms of thesaw tooth notches in the flue bottom, openings through which solidparticles deposited by passing gas may slide by gravity out of the flue,for the purposes set forth.

2. In mechanism of the class described, a furnace having side walls, afloor, and means for supplying hot gas inside the furnace, a flue in aside wall leading to a gas exit passage, said flue being provided with abottom of saw tooth cross section over which gas in the flue passes,there being, in the bottoms of the saw tooth notches in the flue bottom,openings through which solid par' ticles deposited by passing gas mayslide out of the flue, said bottom openings in the flue being adjacentto the furnace floor so that solid particles deposited from the fluefall onto the furnace floor, for the purposes set forth.

3. In mechanism of the class described, a furnace having side walls, afloor, and means for supplying hot gas inside the furnace, a flueextending substantially the length of a side wall leading to a gas exitpassage, said flue being provided with a bottom of saw tooth crosssection over which gas in the flue passes, there being, in the bottomsof the saw tooth notches in the flue bottom, openings through whichsolid particles deposited by passing gas may slide out of the flue, saidbottom openings in the flue being adjacent to the furnace floor so thatsolid particles deposited from the flue fall onto the furnace floor, anddampers for selectively closing certain of said bottom openings, for thepurposes set forth.

4. In mechanism of the class described, a furnace having side walls, afloor, and means for supplying hot gas inside the furnace, at flueextending substantially the length of a side wall leading to a gas exitpassage, said flue being provided with a bottom of saw tooth crosssection over which gas in the flue passes, there being, in the bottomsof the saw tooth notches in the flue bottom, openings through whichsolid particles deposited by passing gas may slide out of the flue, saidbottom openings in the flue being adjacent to the furnace floor so thatsolid particles deposited from the flue fall onto the furnace floor,dampers for selectively closing certain of said bottom openings, andmeans outside the furnace for operating said dampers.

In witness whereof, I have hereunto subscribed my name.

AUBREY J. GRIND'LE.

